|Publication number||US6895627 B1|
|Application number||US 10/768,121|
|Publication date||May 24, 2005|
|Filing date||Feb 2, 2004|
|Priority date||Feb 2, 2004|
|Publication number||10768121, 768121, US 6895627 B1, US 6895627B1, US-B1-6895627, US6895627 B1, US6895627B1|
|Original Assignee||Chieh-Jen Lin|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (20), Classifications (15), Legal Events (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
(a) Field of the Invention
The present invention relates to a blackboard eraser, and more particularly to an improved structure which is easy-to-use, easy-to-empty, and easy-to-disassemble for cleaning.
(b) Description of the Prior Art
A conventional blackboard eraser is generally made from cloth material, and causes a cloud of dust to form when erasing a blackboard and when cleaning the surface of the cloth material by tapping, which can be adverse to the health and environment.
In view of the foregoing shortcomings inherent in a conventional blackboard eraser, the present invention provides an unproved structure, which is easy-to-use, easy-to-empty, and easy-to-disassemble for cleaning.
The primary structure of the present invention is a cube having two symmetrically arranged semi-cylindrical grooves formed in a longitudinal direction therein, and a central brush is affixed to an elevated surface formed between the two grooves. A longitudinal groove is defined underneath each of the semi-cy positioned in each of the longitudinal grooves. Two grooves are arranged adjacent to each end of the semi-cylindrical grooves, and provide for shafts of each roller to dispose therein. The brushes and the rollers thereby form the eraser. When the blackboard eraser is rolling on a blackboard, chalk dust sticks to the rollers, thus erasing the blackboard is made more convenient and cleaner. Moreover, the rollers carry the chalk dust to the side brushes, which wipe the dust, and the dust thus falls into a closed chamber. To clean the accumulated dust, the lid is opened and the dust is emptied out from the chamber, thereby correcting shortcomings of harmful dust flying in the air when tapping the cloth surface of traditional erasers.
To enable a further understanding of the said objectives and the technological methods of the invention herein, the brief description of the drawings below is followed by the detailed description of the preferred embodiments.
FIG. 5 and
A lid 14 is hinged along a top edge of the cube 1, and when closed forms a closed chamber below the lid 14 and above the two semi-cylindrical grooves 11. Equal-length side brushes 15 are affixed to an inner surface of the lid 14 so as to be respectively positioned along each of the longitudinal grooves 111.
In order to keep soft-surfaced rollers 2 properly respectively rolling within the semi-cylinder grooves 11, a shaft 212 is affixed to an end of each roller 2 by symmetric rods 211, with position of each shaft 212 fixed within a central hole 221 of a positioning-washer 22 which is placed in each of the rectangular grooves 12.
When erasing a blackboard with a blackboard eraser 100, chalk dust sticks to the rollers 2 and is carried to the side brushes 15, which wipe the dust off the rollers 2, and the dust falls into the closed chamber. The present invention makes erasing the blackboard more convenient and cleaner, and prevents a dust-cloud from forming. To clean the accumulated dust, the lid 14 is opened, and the dust is emptied out from the chamber. The present invention is indeed an environmental friendly design.
After a period of time, a user may open the lid 14 and empty out the dust from the chamber, thereby providing for easy cleaning and preventing the dust from flying in the air, which would otherwise cause an environmental pollution issue.
It is of course to be understood that the embodiment described herein is merely illustrative of the principles of the invention and that a wide variety of modifications thereto may be effected by persons skilled in the art without departing from the spirit and scope of the invention as set forth in the following claims.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
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|CN101823062A *||Apr 15, 2010||Sep 8, 2010||深南电路有限公司||Dust-binding device|
|CN102336104A *||Oct 28, 2011||Feb 1, 2012||朱芯雨||Novel blackboard brush|
|WO2006130216A1 *||Apr 3, 2006||Dec 7, 2006||S.C. Johnson & Son, Inc.||Fabric sweeper|
|WO2012166567A1 *||May 25, 2012||Dec 6, 2012||S. C. Johnson & Son, Inc.||Quick pickup device for debris on any surface with positive capture|
|U.S. Classification||15/98, 15/210.1, 434/417, 15/27, 15/221|
|International Classification||B43L21/00, A47L13/38, B43L21/02, B43L19/00|
|Cooperative Classification||B43L19/0068, B43L21/02, B43L19/0037|
|European Classification||B43L19/00D, B43L21/02, B43L19/00H3|
|Dec 1, 2008||REMI||Maintenance fee reminder mailed|
|May 15, 2009||SULP||Surcharge for late payment|
|May 15, 2009||FPAY||Fee payment|
Year of fee payment: 4
|Jan 7, 2013||REMI||Maintenance fee reminder mailed|
|May 24, 2013||LAPS||Lapse for failure to pay maintenance fees|
|Jul 16, 2013||FP||Expired due to failure to pay maintenance fee|
Effective date: 20130524